i have a 12" pb. the tip of the power adapter broke off. i opened the case, removed the broken tip replaced the adapter and the battery still will not charge. the lights on the bottom of the battery all illuminate one by one then just one remains on, blinking slowly. the adapter glows orange as if it was charging but the battery doesnt take a charge. i booted into open firmware and reset-nvram and set-defaults reset-all but no change. is it the dc IN, the battery, what. any advice